Which of the following gases in the atmosphere provides a shield against the harmful ultraviolet rays of the sun?
| A. | Carbon monoxide |
| B. | Oxygen |
| C. | Nitrogen |
| D. | Ozone |
Answer : D Explanation : |
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Option: A Explanation : Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here. |
